ron-rich rocks near ancient lake sites on Mars could hold vital clues that show life once existed there, research suggests.
These rocks -- which formed in lake beds -- are the best place to seek fossil evidence of life from billions of years ago, researchers say.
A new study that sheds light on where fossils might be preserved could aid the search for traces of tiny creatures -- known as microbes -- on Mars, which it is thought may have supported primitive life forms around four billion years ago.
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